Answer 1

我过去做过这种方式的方法是使用原始购物车中的<merchanrt-private-data>标记，例如：

<checkout-shopping-cart xmlns='http://checkout.google.com/schema/2'>
 <shopping-cart>
  <merchant-private-data>
   <merchant-note>[some secret about the cart on my system]</merchant-note>
  </merchant-private-data>
  <items>
   ...
  </items>
 </shopping-cart>
</checkout-shopping-cart>

然后，在Google使用序列号回拨后，我使用Notification History API检索订单详细信息，然后包含我的私人数据，例如：

<new-order-notification xmlns="http://checkout.google.com/schema/2" serial-number="[serial number from google]">
 <buyer-billing-address>
  ...
 </buyer-billing-address>
 <timestamp>...</timestamp>
 <google-order-number>...</google-order-number>
 <order-summary>
  <total-chargeback-amount currency="GBP">...</total-chargeback-amount>
  <google-order-number>...</google-order-number>
  <total-charge-amount currency="GBP">...</total-charge-amount>
  <total-refund-amount currency="GBP">...</total-refund-amount>
  <purchase-date>...</purchase-date>
  <archived>false</archived>
  <shopping-cart>
   <merchant-private-data>
    <merchant-note>[the secret about the cart from my system]</merchant-note>
   </merchant-private-data>
   <items>
   </items>
  </shopping-cart>
  <order-adjustment>
   ...
  </order-adjustment>
  <promotions />
  <buyer-id>...</buyer-id>
  <buyer-marketing-preferences>
   <email-allowed>false</email-allowed>
  </buyer-marketing-preferences>
  <buyer-shipping-address>
   ...
  </buyer-shipping-address>
  <order-total currency="GBP">...</order-total>
  <fulfillment-order-state>NEW</fulfillment-order-state>
  <financial-order-state>REVIEWING</financial-order-state>
 </order-summary>
 <shopping-cart>
  <merchant-private-data>
    <merchant-note>[the secret about the cart from my system]</merchant-note>
  </merchant-private-data>
  <items>
  </items>
 </shopping-cart>
 <order-adjustment>
  ...
 </order-adjustment>
 <promotions />
 <buyer-id>...</buyer-id>
 <buyer-marketing-preferences>
  <email-allowed>false</email-allowed>
 </buyer-marketing-preferences>
 <buyer-shipping-address>
  ...
 </buyer-shipping-address>
 <order-total currency="GBP">...</order-total>
 <fulfillment-order-state>NEW</fulfillment-order-state>
 <financial-order-state>REVIEWING</financial-order-state>
</new-order-notification>

然后，我可以使用该秘密将订单与我之前存储在数据库中的详细信息进行匹配。